Osip and Nadezhda Mandelstam

On page 112, Coetzee mentions that Nadezhda Mandelstam wrote a memoir, “Hope against Hope,” and that she “encouraged a myth of Mandelstam as the sacrificed artist-hero, Prometheus and Christ.” How was the book perceived? Also, what do people think of Osip Mandelstam today and/or was he a major influence in the Soviet Union or literature?